The benefits of a topic-based architecture

While DITA does not require the use of any particular
writing practice, the DITA architecture is designed to support
authoring, managing, and processing of content that is designed
to be reused. Although DITA provides significant value even when reuse
is not a primary requirement, the full value of DITA is realized
when content is authored with reuse in mind. To develop topic-based
information means creating units of standalone information that are
meaningful with little or no surrounding context.

By organizing content into topics that are written
to be reusable, authors can achieve several goals:

Content is readable when accessed from an index or search, not
just when read in sequence as part of an extended narrative. Since
most readers do not read technical and business-related information
from beginning to end, topic-oriented information design ensures that
each unit of information can be read independently.

Content can be organized differently for online and print delivery.
Authors can create task flows and concept hierarchies for online
delivery and create a print-oriented hierarchy to support a narrative
content flow.

Content can be reused in different collections. Since a topic
is written to support random access (as by search), it should
also be understandable when included as part of various product deliverables.
Topics permit authors to refactor information as needed, including
only the topics that apply to each unique scenario.

Content is more manageable in topic form whether managed
as individual files in a traditional file system or as objects
in a content management system.

Content authored in topics can be translated and updated
more efficiently and less expensively than information authored
in larger or more sequential units.

Content authored in topics can be filtered more efficiently,
encouraging the assembly and deployment of information subsets
from shared information repositories.

Topics written for reuse should be small enough to
provide opportunities for reuse but large enough to be coherently
authored and read. When each topic is written to address a single
subject, authors can organize a set of topics logically and achieve
an acceptable narrative content flow.